Finding the Fourth Proportional to 8,780.54, 12,113.69 and 5,417.49

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780.54 : 12,113.69 = 5,417.49 : x
2. Step 2: Convert to fraction form
   8,780.54/12,113.69 = 5,417.49/x
3. Step 3: Cross multiply
   8,780.54x = 12,113.69 × 5,417.49
4. Step 4: Simplify right side
   8,780.54x = 65,625,767.35
5. Step 5: Solve for x
   x = 65,625,767.35/8,780.54
6. Step 6: Final answer
   x = 7,474.01